Hi
I am having some difficulty plotting and interpreting wind vectors using
the NCEP reanalysis files. The data values seem too large, I think?.
I used ncl's "min" and "max" functions to generate variable summaries
for u and v winds.
The NCEP u and v wind component files are
uwnd.mon.mean.p.nc
vwnd.mon.mean.p.nc
I used the following statement to generate the output copied below.
print("min/max slp_anom = " + min(slp_anom) + "/" + max(slp_anom))
Magnitude of min and max values seem too large as indicated by the
copied output of variable summaries below.
Do min and max values seem OK? Am I missing something in interpreting
the variable values?
Thanks.
Ed
*************************************************************************
Variable: u
Type: short
Total Size: 271272672 bytes
135636336 values
Number of Dimensions: 4
Dimensions and sizes: [time | 759] x [level | 17] x [lat | 73] x [lon
| 144]
Coordinates:
time: [17067072..17620752]
level: [1000..10]
lat: [90..-90]
lon: [ 0..357.5]
Number Of Attributes: 16
long_name : Monthly mean u wind
actual_range : ( -66.37, 124.4 )
unpacked_valid_range : ( -125, 160 )
units : m/s
add_offset : 202.65
scale_factor : 0.01
missing_value : 32766
precision : 2
least_significant_digit : 1
var_desc : u-wind
dataset : CDC Derived NCEP Reanalysis Products
level_desc : Multiple levels
statistic : Mean
parent_stat : Other
valid_range : ( -32765, -4265 )
_FillValue : 32766
(0) min/max u = -26902/-7825
Variable: v
Type: short
Total Size: 271272672 bytes
135636336 values
Number of Dimensions: 4
Dimensions and sizes: [time | 759] x [level | 17] x [lat | 73] x [lon
| 144]
Coordinates:
time: [17067072..17620752]
level: [1000..10]
lat: [90..-90]
lon: [ 0..357.5]
Number Of Attributes: 16
long_name : Monthly mean v wind
actual_range : ( -66.65, 66.39 )
unpacked_valid_range : ( -125, 160 )
units : m/s
add_offset : 202.65
scale_factor : 0.01
missing_value : 32766
precision : 2
least_significant_digit : 1
var_desc : v-wind
dataset : CDC Derived NCEP Reanalysis Products
level_desc : Multiple levels
statistic : Mean
parent_stat : Other
valid_range : ( -32765, -4265 )
_FillValue : 32766
(0) min/max v = -26930/-13626
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Received on Wed Apr 27 15:44:58 2011
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